Interfacial charge transfer in Pt-loaded TiO^sub 2^ P25 photocatalysts studied by in-situ diffuse reflectance FTIR spectroscopy of adsorbed CO
The efficiency of photocatalytic systems is strongly depending on the charge carrier transfer from the excited semiconductor to co-catalyst particles attached on its surface. In this study, we investigated the influence of photo-induced charge transfer in photoplatinized TiO2 P25 photocatalysts by d...
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| Veröffentlicht in: | Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2019-02, Vol.370, p.84 |
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| container_title | Journal of photochemistry and photobiology. A, Chemistry. |
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| creator | Litke, Anton Frei, Heinz Hensen, Emiel JM Hofmann, Jan P |
| description | The efficiency of photocatalytic systems is strongly depending on the charge carrier transfer from the excited semiconductor to co-catalyst particles attached on its surface. In this study, we investigated the influence of photo-induced charge transfer in photoplatinized TiO2 P25 photocatalysts by diffuse reflectance FTIR spectroscopy of CO molecules adsorbed on the Pt co-catalyst under well-defined gas phase conditions. In contrast to aqueous conditions, where shifts of the CO stretching vibration of up to 50 cm−1 have been reported, the observed shifts under gas phase conditions are very small ( |
| doi_str_mv | 10.1016/j.jphotochem.2018.10.023 |
| format | Article |
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In this study, we investigated the influence of photo-induced charge transfer in photoplatinized TiO2 P25 photocatalysts by diffuse reflectance FTIR spectroscopy of CO molecules adsorbed on the Pt co-catalyst under well-defined gas phase conditions. In contrast to aqueous conditions, where shifts of the CO stretching vibration of up to 50 cm−1 have been reported, the observed shifts under gas phase conditions are very small (<1 cm−1). This demonstrates that the difference in dielectric properties between aqueous electrolytes and vacuum are critical for the development of prominent shifts of adsorbed CO bands upon trapping of photogenerated charge carriers on co-catalyst particles. The experimental findings are discussed in terms of an electrostatic Stark effect, charge screening, co-adsorption, coverage-dependent shifts of the vibrational bands of adsorbed CO and photocatalytic surface reactions.</description><identifier>ISSN: 1010-6030</identifier><identifier>EISSN: 1873-2666</identifier><identifier>DOI: 10.1016/j.jphotochem.2018.10.023</identifier><language>eng</language><publisher>Lausanne: Elsevier BV</publisher><subject>Aqueous electrolytes ; Catalysis ; Catalysts ; Charge transfer ; Cobalt ; Current carriers ; Dielectric properties ; Electrical properties ; Fourier transforms ; Infrared spectroscopy ; Photocatalysis ; Photocatalysts ; Platinum ; Reflectance ; Spectroscopy ; Spectrum analysis ; Stark effect ; Surface reactions ; Titanium dioxide ; Vacuum ; Vapor phases ; Vibration</subject><ispartof>Journal of photochemistry and photobiology. 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A, Chemistry.</title><description>The efficiency of photocatalytic systems is strongly depending on the charge carrier transfer from the excited semiconductor to co-catalyst particles attached on its surface. In this study, we investigated the influence of photo-induced charge transfer in photoplatinized TiO2 P25 photocatalysts by diffuse reflectance FTIR spectroscopy of CO molecules adsorbed on the Pt co-catalyst under well-defined gas phase conditions. In contrast to aqueous conditions, where shifts of the CO stretching vibration of up to 50 cm−1 have been reported, the observed shifts under gas phase conditions are very small (<1 cm−1). This demonstrates that the difference in dielectric properties between aqueous electrolytes and vacuum are critical for the development of prominent shifts of adsorbed CO bands upon trapping of photogenerated charge carriers on co-catalyst particles. The experimental findings are discussed in terms of an electrostatic Stark effect, charge screening, co-adsorption, coverage-dependent shifts of the vibrational bands of adsorbed CO and photocatalytic surface reactions.</description><subject>Aqueous electrolytes</subject><subject>Catalysis</subject><subject>Catalysts</subject><subject>Charge transfer</subject><subject>Cobalt</subject><subject>Current carriers</subject><subject>Dielectric properties</subject><subject>Electrical properties</subject><subject>Fourier transforms</subject><subject>Infrared spectroscopy</subject><subject>Photocatalysis</subject><subject>Photocatalysts</subject><subject>Platinum</subject><subject>Reflectance</subject><subject>Spectroscopy</subject><subject>Spectrum analysis</subject><subject>Stark effect</subject><subject>Surface reactions</subject><subject>Titanium dioxide</subject><subject>Vacuum</subject><subject>Vapor phases</subject><subject>Vibration</subject><issn>1010-6030</issn><issn>1873-2666</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqNTctOxCAUJUYTx8c_3MR1K1DE7idOnNVMJl3PhFKwNBUqFxb9Cb9ZEv0AV-edQwgwWjPK5PNUT8sYUtCj-aw5ZW2xa8qbK7Jh7WtTcSnldeGU0UrSht6SO8SJUiqEYBvyvffJRKu0UzPoUcUPAykqj9ZEcB6OqZqDGswAnTucMffAz3DkL_B7qpKaV0wImPLgSqtfy6pClzIMztqMBqKxs9FJeW1g1-1PgEuRMaAOywrBghowxL6Mt4cHcmPVjObxD-_J0-6t275XSwxf2WC6TCFHX6ILZ60QDRdSNv9r_QC0ZV7x</recordid><startdate>20190201</startdate><enddate>20190201</enddate><creator>Litke, Anton</creator><creator>Frei, Heinz</creator><creator>Hensen, Emiel JM</creator><creator>Hofmann, Jan P</creator><general>Elsevier BV</general><scope>7QL</scope><scope>7T7</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope></search><sort><creationdate>20190201</creationdate><title>Interfacial charge transfer in Pt-loaded TiO^sub 2^ P25 photocatalysts studied by in-situ diffuse reflectance FTIR spectroscopy of adsorbed CO</title><author>Litke, Anton ; Frei, Heinz ; Hensen, Emiel JM ; Hofmann, Jan P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_journals_21844324663</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Aqueous electrolytes</topic><topic>Catalysis</topic><topic>Catalysts</topic><topic>Charge transfer</topic><topic>Cobalt</topic><topic>Current carriers</topic><topic>Dielectric properties</topic><topic>Electrical properties</topic><topic>Fourier transforms</topic><topic>Infrared spectroscopy</topic><topic>Photocatalysis</topic><topic>Photocatalysts</topic><topic>Platinum</topic><topic>Reflectance</topic><topic>Spectroscopy</topic><topic>Spectrum analysis</topic><topic>Stark effect</topic><topic>Surface reactions</topic><topic>Titanium dioxide</topic><topic>Vacuum</topic><topic>Vapor phases</topic><topic>Vibration</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Litke, Anton</creatorcontrib><creatorcontrib>Frei, Heinz</creatorcontrib><creatorcontrib>Hensen, Emiel JM</creatorcontrib><creatorcontrib>Hofmann, Jan P</creatorcontrib><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Virology and AIDS Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><jtitle>Journal of photochemistry and photobiology. 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| ispartof | Journal of photochemistry and photobiology. A, Chemistry., 2019-02, Vol.370, p.84 |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Aqueous electrolytes Catalysis Catalysts Charge transfer Cobalt Current carriers Dielectric properties Electrical properties Fourier transforms Infrared spectroscopy Photocatalysis Photocatalysts Platinum Reflectance Spectroscopy Spectrum analysis Stark effect Surface reactions Titanium dioxide Vacuum Vapor phases Vibration |
| title | Interfacial charge transfer in Pt-loaded TiO^sub 2^ P25 photocatalysts studied by in-situ diffuse reflectance FTIR spectroscopy of adsorbed CO |
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